Put a LID on It

By Dixie Reid

May 1st, 2017

A joint effort exists at Sacramento State University in California to make sustainability a priority. Students, faculty and staff work together, not just to make the campus more sustainable, but also to create a culture where sustainability is second nature.

The 24 LID (low-impact development) devices in seven campus locations collect and filter 2.9 million gallons of stormwater each year, greatly reducing the university’s impact on the neighboring American River. Sediment and metal loads flowing into the river from those seven locations are down 60 percent to 90 percent on average.

“The whole project is about protecting the American River,” says Maureen Kerner, research engineer with Sacramento State’s Office of Water Programs (OWP). “Before this project, stormwater runoff on campus was collected and pumped over the levee directly into the river, carrying pollutants with it.”

The university is protecting the river’s many beneficial uses, including Sacramento’s municipal water supply; the aquatic habitat; and recreational boating, swimming and fishing.

In 2014, the state Water Resources Control Board awarded OWP and the City of Sacramento $2.6 million in Proposition 84 clean-water funds to design, build and monitor the LID project. Sacramento State added $500,000 in matching funds, and the City of Sacramento contributed another $112,000. Construction began in June 2015.

Today, the system of innovative LID devices — bioretention planters, a flow-through planter, rain gardens, an infiltrating bioswale, roof downspout disconnects and porous pavement — is functioning as planned. In addition to reducing stormwater runoff into the river and preventing erosion, the devices replenish campus groundwater supplies that are used for irrigation.

“You will see many more devices pop up around campus as the university implements its Master Plan to expand green-space connectivity and better manage stormwater through more aesthetic and sustainable practices,” Kerner says.

Plans include installing stormwater planters and a dry well near Parking Structure V, which will be built on the site of the current Parking Lot 1. The dry well will include a pretreatment vault where pollutants will settle before the runoff is directed into a 20-foot subsurface well to recharge the groundwater.

“The LID project has gone a long way in promoting the use of sustainable stormwater practices locally and regionally,” Kerner says. “Several other colleges and universities are mimicking our project and installing stormwater planters and porous pavement.”

Awards, and an Ongoing Effort

The campus LID project has won two major awards: The California Stormwater Quality Association (CASQA) last year named it the state’s outstanding stormwater best management practices implementation project. And, in 2015, the Sacramento section of the American Society of Civil Engineers recognized it as the region’s best urban development project.

The LID team has created an array of educational materials related to the project, including eye-catching signs posted at the seven locations, as well as one near the west end of the Guy West Bridge. Sacramento State computer science students helped the LID team develop a self-guided walking tour for mobile devices — www.owp.csus.edu/lid — as a part of their senior-design project. It has had more than 800 unique views since its launch in September 2016.

The campus LID website (www.owp.csus.edu/csus-lid) is a great resource for anyone planning a similar project. It includes design plans, construction information, monitoring details and a rundown of the drought-tolerant plants used in the project.

A Growing Reputation

The successful campus LID project adds to Sacramento State’s reputation as one of the world’s most sustainable campuses.

Last year, for instance, the Association for the Advancement of Sustainability in Higher Education (AASHE) — a national nonprofit that empowers higher education institutions worldwide to lead the sustainability movement — awarded the university a Gold rating. That put the university in elite company among the 650 colleges and universities on six continents that voluntarily report to STARS, the association’s sustainability tracking system. Sacramento State has the highest score in the 23-campus California State University (CSU).

AASHE also named Sacramento State a top performer in its 2016 Sustainable Campus Index, giving it a No. 3 overall ranking among master’s institutions (schools that award at least 50 master’s degrees and fewer than 20 doctoral degrees annually).

This article originally appeared in the May 2017 issue of College Planning & Management.

About the Author

Dixie Reid is a Public Affairs writer for Sacramento State University (www.csus.edu). She can be reached at dixie.reid@csus.edu.